Drafting-tool



(No Model.)

B. H. RODNEY. DRAFTING TOOL.

No. 586,626. Patented July 20,1897.

UNITED STATES PATENT OFFICE.

EUGENE H. ROONEY, OF MILXVAUKEE, \VISCONSIN.

DRAFTlNG-TOOL.

SPECIFICATION forming part of Letters Patent No. 586,626, dated July 20,1897. Application filed July 13, 1895. Serial No. 555,893. (No model.)

To (LZZ whom it 711,0. ROI/166772,.

Be it known that I, EUGENE II. ROONEY, a citizen of the United States,and a resident of Milwankeefin the county of Milwaukee and State oflVisconsin, have invented certain new and useful Improvements inDrafting- Tools; and I do hereby declare that the following is a full,clear, and exact description thereof.

Hy invention has for its object to provide for a simple, economical, andaccurate drafting-tool having the nature of a beamcompass, but capableof organization for a variety of uses in large work; and it consists incertain peculiarities of construction and combina' tion of partshereinafter described with reference to the accompanying drawings andsubsequently claimed.

In the drawings, Figure 1 represents afront elevation of assembled partsembodied in my invention, some of these parts being shown broken and insection; Fig. 2, a plan View, partly in horizontal section, illustratingan inversion of a trammel-head that appears in the preceding figure andis provided with an adjustable rest for a leg shown in connectiontherewith, this leg being made to have the function of a scriber,caliper, or edge-center; Fig. 3, a vertical transverse section showingsaid trammel-head and legin connection with a beam, the aforesaid legappearing for the most part in elevation; Fig. 4, an elevation ofanother tramme1-head and leg, shown in the first figure, the beam towhich this latter head is connected being illustrated in crosssection;Fig. 5, a side elevation illustrating a pivotal adjustable surface-gagethat may be substituted for one of the above-mentioned legs, and Fig. 6a perspective view of a pencil-clamp attachable on a fixed point of oneof the trammel-heads.

Referring by letter to the drawings, A represents a beam to which thetrammel-heads, hereinafter more particularly described, are attached,and as one of the particular fea tures of my invention saidtrainmel-heads are organized to grip on four sides of a squareindependent of the depth or width of the beam, whereby I not onlyprovide for the best possible and accurate union of said heads and beam,but am also enabled to have the latter of various dimensions in matterof depth,

width, or both, according to the rigidity necessary for the work inhand.

I have shown a beam of considerable depth and width, having each of tworight-angle faces provided with a kerf, and by means of these kerfs Iobtain sufficient of four sides of a standard square (partially shown bydotted lines in Fig. 3) upon which to grip the tram- Inel-heads. Henceit will be seen that the beam may have the dimensions of the stand ardsquare or that its deptlnwidth, or both may be as great as is necessaryto obtain a suflicient amount of rigidity for the work in hand. It alsofollows that the beam may be square or otherwise in cross-section,provided it presents diagonally opposite right-angle corners andsufficient of four sides of the standard square to permit rigid grip ofthe trammelheads, said standard square being of any suitable dimensions,dependent on the proportions of said trammel-heads.

Each tramniel-head comprises two pivotally-united sections B O, and eachof these sections is formed with a right-angle jaw that grips a cornerand two sides of the aforesaid standard square, the corner gripped byone jaw being diagonally opposite that gripped by the other. I show eachhead-section 13 provided with a lug b and a serew-threaded stem 0,straddled by a bifurcated portion of the otherhead-section O, theconnecting-pivot d being run through this bifurcated portion of thelatter head-section and the lug on the former head-section. A washer eis arranged on the screw-threaded stem 0 against the bifurcated portionof head -section 0, and a thumb-nut f, run on said stem, clamps theentire head in its adjusted position on the beam A, the tightening ofthe not causing a pressure of the jaws in a straight line diagonally ofsaid beam.

By means of a spring g, arranged intermediate of the head-sections B Oto contract under pressure of the nut f, I provide for an automatic liftof the latter head-section when said pressure of the nut is slackened,thereby making it easy to put the head upon the beam and to adjust itthereon.

The section B of each tram incl-head is provided with an angular seatfor a leg that is polygonal in cross-section, and constituting part ofsaid head-section is a triangular bail 7L, having a screw-threaded stem2' extending therefrom. A gib D engages the bail h to grip the polygonalleg, and a washer j on the stern t' against the gib is opposed by athumbnut 7c, that is tightened to clamp said leg in its seat. Owing toits polygonal contour each of the legs constituting part of the hereindescrihed tool has at least two parallel knife-edge bearings, one in thetrammel-head and the other in the clamping-gib, whereby an absoluteright angle to the beam may be had.

As shown in Fig. 3, the thumb-nut 7c is preferably recessed to form achamber for a spiral spring m, expansible against the washer 15 j, andthe latter pressing on the gib D the polygonal leg is held in frictionalcontact with its seat when said nut is loosened. Consequently itrequires some exertion on the part of the operator to vertically adjustsaid leg, this being a desirable feature of my invention.

One of the trammel-heads has its section B provided with a dependingclamp n and an ear 1), parallel to the clamp, the ear being tapped tosuit a fine thread on a screw E, that engages it and said clamp. Thescrew 0, that controls the clamp, is tightened to prevent rotation ofthe screw,-and a coarse thread on this screw is engaged by a cylindricaltraveler F, having an annular groove that conforms in contour with theleg pertaining to the trammel-head, from which said screw is suspended.A set-screw s and bearing-block tin the cylindrical traveler operate tolock the latter against rotation on the screw.

By rotation of the screw or the traveler thereon I'provide for a fineadjustment of the leg in engagement with the traveler-groove after anapproximate adjustment has been 'had by movement of the trammel-head onthe beam, and as it is necessary to said adjustment that provision bemade for lateral movement of the leg-gripping gib and for pivotalmovement of the leg I make the legseat on said trammel-head quiteshallow and the stem opening in the said gib elongated in the directionof the beam, as will be apparent by reference to Figs. 1, 2, and 3.

Each of the two legs herein shown is tapered to a sharp central point atone end for the purpose of scribing, and the other end of each leg isoffset to form a blunt caliper-point. I also scale the legs in oppositedirections for the purpose of determining their proper adjustment,either as scribers, calipers, or a combination of both. The flat caliperend of one leg G has a vertical socket for a gage attachment H, heldpivotally in place by means of a screw to, run through a cylindricalshank portion thereof into said leg, and the working face of this gageattachment is on the same vertical line as the scribe-point of theaforesaid leg. The working face of the gage II is also provided with acenter-mark to, that indicates the center of leg G, and a sightnotch 00and sight-opening y in said gage are for the purpose of comparing saidmark with a point on the edge of the object on which a circle is to bescribed.

\Vhen the gage H is to be used, the leg is put in position reverse tothat shown in the drawings,and the working face of said gage being heldagainst an edge of the work the scribing is done with the sharp point ofthe other leg I, there being free rotation of the former leg on thecylindrical shank of the aforesaid gage when the scribing operationtakes place.

The caliper end of leg I is provided with a right-angle notch .2, thevertical face of which is on the same vertical line as the scribe-pointof said leg. Hence it follows that if after determining a dimension byset of the scribepoints one of the legs be reversed the vertical face ofsaid angle-notch will take the place formerly occupied by a scribe-pointand serve as a gage-stop in conjunction with the other scribe-point, thedistance between the latter and aforesaid vertical face of theangle-notch being exactly the same as the dimension first obtained bysetting both scribe-points, this being one of the especial advantages ofmy invention. It also follows that a pencil may be substituted for theleg G and used in connection with the notched end of leg I, whereby Iorganize the tool as an adjustable surface-gage.

The screw-threaded stem 0 of the trammel-head described in connectionwith the leg I is shown provided with a scribe-point extension J, and inFig. 5 I show a gage K in preferably pivotal connection with a shank L,so as to be set at various angles, a setscrew M being employed tomaintain the adjustment.

The gage-shank has the same contour and dimensions in cross-section asthe legs G I, and hence the gage may be substituted for either leg foruse in connection with the other leg or the point J above specified toscribe or gage parallel lines.

A pencil-clamp (shown in Fig. 6) may be used on the point J, and thispencil-clamp comprises a clip N, differentially grooved upon its innerside, and a gib O, joined to the clip by a set-screw P, the gib being ofsuch contour that it may be arranged on said clip to bind either a leador slate pencil in place, there being a difference of diameter in saidpencils of standard make.

The trammel-heads and their attachments used in connection with asuitable beam constitute a tool of great convenience to patternmakers,machinists, and others, inasmuch as said tool may be organized for somany varieties of work, and as one of the especially importantadvantages of my invention I call attention to the matter of positivecenters resulting from the construction of said trammel-heads and thelegs that seat therein.

Having thus described my invention, what I claim as new, and desire tosecure byLetters Patent, is-

1. A trammeLhead comprising two pivotally-connected sections, each ofwhich has a right-angle jaw diagonally opposite the jaw of the other, ascrew-threaded stem extending from one section through the other, a nutoperative on the stem to clamp said jaws on a beam, and one of thesections provided with a tool-clamp.

2. A trammel-beam having at least two right-angle faces each providedwith a longitudinal kerf so arranged that with said rightangle faces thebeam presents diagonal corners and suflicient of four sides of astandard square, independent of its remaining dimensions or contour,upon which to grip right angle jaws of a tool-supporting clamp.

3. A trammel-leg having one end in the form of a scribing-point and theother end provided with a pivotal gage the working face of which is inline with the scribing-point.

4:. A trammel-leg having one end in the form of a scribing-point, theother end in the form of a caliper-point, and a pivotal gage at thelatter end of the leg having its working face in line with thescribing-point.

5. A trammel-head comprising two pivotally-connected sections, each ofwhich has a right-angle jaw diagonally opposite the jaw of the other, ascrew-threaded stem extending from one section through the other, a nutoperative on the stem to clamp said jaws on a beam, a tool'clamp carriedby one of the sections, and a scribe-point extended from the other ofsaid sections.

6. A trammel-head comprising two pivotally-connected sections, each ofwhich has a right-angle jaw diagonally opposite the jaw of the other, ascrew-threaded stem extending from one section through the other, aspring intermediate of said sections, a nut operative on the stem toclamp said jaws on a beam,

and a tool-clamp carried by one of the aforesaid sections of the head.

'7. A tram1nel-head comprising two pivotally-connected sections, each ofwhich has a right-angle jaw diagonally opposite the jaw of the other, ascrew-threaded stem extending from one section through the other, a nutoperative on the stem to clamp said jaws on a beam, an angular legfitting a seat in one of said head-sections, a bail extending from thesame section and terminated in a screwthreaded stem, a leg-gripping gibloose on the bail-stem, and a gib-clamping nut adjustable on the latterstem.

8. A trammel-head comprising two pivotally-conneoted sections, each ofwhich has a right-angle jaw diagonally opposite the jaw of the other, ascrew-threaded stem extending from one section through the other, a nutoperative on the stem to clamp said jaws 011 a beam, an angular legfitting a seat in one of said head-sections, a bail extending from thesame section and terminated in a screw threaded stem, a leg-gripping gibloose on the bail-stem, a washer opposing the outer face of the gib, aspiral spring in touch with the washer, and a chambered nut run 011 thelatter stem against the spring and washer.

9. A trammel-head provided with a legclamp, a screw having a fine-threadconnection with the head parallel to a beam upon which the same may beadj ustably secured, and a leg-traveler adjustable on a coarsethreadedportion of the screw. 7

10.'A trammel-head provided with a legclamp, a screw having afine-thread connection with the head parallel to a beam upon which thesame may be adj ustably secured, a leg-traveler adj ustable on acoarse-threaded portion of the screw, and suitable means forindependentlylocking the screw and leg-traveler in adjusted position.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee and State of VVisoonsin, in thepresence of two witnesses.

EUGENE lI. ROONEY.

\Vitnesses:

Gno. W. YOUNG, N. E. OLIPHANT.

